On Neplicliuc-basalt from Yingc-mcn, Manchuria. 3 



composition and texture, the cuneiform spaces left by fresli, 

 polysynthetic tabular plagioclase being filled up with analcime. 

 They may be analcime-diabase (basalt) or teschenite, and seem to 

 be akin to those of California, described by Fairbanks^-*, and 

 many others. Since I could not examine the mode of their 

 occurrence, and also as I was unable to find a sure trace of either 

 nepheline or leucite, I have simply left them undescribed. A 

 short description has, however, already been given of the analcimc- 

 hasalt of the Pescadore group (HOko-tô) iu Taiwan^'. 



Three years ago, I found in a Geological Survey specimen from 

 the islet of Matsushima, Kyushu, a rock ]-esembling an aegirine- 

 trachyte on which Kozu^^ has very recently given a preliminary 

 note. It is a grayish, trachytic-lookiug laurvikose soda-trachyte 

 with calcium-bearing anorthoclase. The alkali-feldspar-bearing 

 basalts from northern parts of Kyû-shû are also brought to our 

 notice by the same writer'^ What seem to be barkevikite-bearing 

 rhyolites or andésites, I have several times observed from Kodzn- 

 shima, one of the Idzu islands, and also from the islet of Koto-sho 

 (Botel-Tobago), Taiwan. From the above brief account, which 

 might be multiplied if careful searcli were made, we see that even 

 alkaline effusives of basic and acid natures are by no means rare in 

 Japanese islands. 



1) " On Analcite-diabase from San Luis Obispo County, California." Bull. Geol. Depart. Univ. 

 Cal., vol. T., p. 273. I am always watching with keen interest the progress on the knowledge of 

 the Miocene analcite-diabase (augite-teschenito or basalt) of California by American writers. If 

 there is any thing which may be called a petrographical province, it is this very rock -group 

 which unites both sides of the Xorth Pacific. There are, as it is already stated, many localities 

 m Japan where the so-called analcime-diabase occurs in dykes or sheets, and one of the allied 

 rocks is the " don " which produced natural cokes by its contact action in many collieries in 

 northern Kyûshû. The most interesting point in the studies of these rocks centers in the 

 presence of analcime which was at one time supposed to be dirived from nepheline, and at other 

 times from decomposition of labradoiite. The latter view is, I think, still entertained by L, 

 Haehl and E. Arnold. (Proc. Philos. Soc. vol. XLTII. Xo. 175.) 



2) Koto, loc. cit., p. 42. 



3) Preliminary Xotes on Some Igneous Eocks of Japan." J. Jour. Geol., vol. xix. 1911, p. 555. 



4) " Preliminary Notes etc." III. Loc. cit., p. 566. 



